More about limbs

The shape of a dinosaur’s feet depended on whether it walked on two or four legs. Four-legged dinosaurs had similar front and rear feet, spreading their weight on hooflike toes. Two-legged dinosaurs could use their front feet like hands, grasping at prey or holding plant food.
STOUT LIMBS
Widely spaced toes and thick, stout limb bones helped Triceratops spread the weight of its massive body. The shorter forelimbs carried the weight of Triceratops’ huge head. Much of the body weight was supported by the long and powerful rear legs. Short and stubby toes on all four feet ended in hoof-shaped claws.
GIANT CLAW
The powerful carnivore Baryonyx had one of the largest dinosaur claws known. The curved talon, which was 12 in (31 cm) long, formed a huge weapon on Baryonyx’s hand.
IGUANODON HAND
Iguanodon could use its hands in several ways. It could use the hoofed middle fingers for walking, and the long fifth fingers could hook onto plants. The thumb spikes were probably defensive weapons used for stabbing enemies.
CLAW FOR PROTECTION
Apatosaurus, a giant sauropod dinosaur, had a pointed claw on each front foot, which it may have used for defense.
DINOSAUR PRINT
Iguanodon left many clues behind when it became extinct. When it walked on damp sand or mud it left footprints, which dried and became preserved. The footprints of an adult Iguanodon would have been about 35 in (90 cm) long.